437 lines
11 KiB
C
437 lines
11 KiB
C
#include <LPC17xx.h>
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#include <stdbool.h>
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/* ===================================================
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* SMART CALCULATOR - LPC1768 (Final v2)
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* Supports BIN, BASE4, OCT, DEC, and HEX
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* with 4x4 keypad, LCD, and 7-seg status display.
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*
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* Features:
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* - Base-aware arithmetic and I/O
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* - HEX: double MODE button press within 2s = operator mode
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* - Hardware 1ms timing via SysTick
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* ===================================================
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*/
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/* 7-Segment patterns for 0–F */
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const unsigned char seven_seg[16] = {
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0x3F, 0x06, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x07,
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0x7F, 0x6F, 0x77, 0x7C, 0x39, 0x5E, 0x79, 0x71
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};
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/* ===== Pin & Mode Definitions ===== */
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#define COL_BASE 15
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#define ROW_BASE 19
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#define COL_MASK (0x0F << COL_BASE)
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#define ROW_MASK (0x0F << ROW_BASE)
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#define SEG_SHIFT 4
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#define DIGIT_EN (1 << 23)
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#define LCD_DATA_SHIFT 23
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#define LCD_DATA_MASK (0x0F << LCD_DATA_SHIFT)
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#define LCD_RS (1 << 27)
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#define LCD_EN (1 << 28)
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#define MODE_BUTTON (1 << 12)
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/* Supported Bases */
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#define MODE_BIN 2
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#define MODE_BASE4 4
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#define MODE_OCT 8
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#define MODE_DEC 10
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#define MODE_HEX 16
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/* Operators */
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#define OP_NONE 0
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#define OP_ADD 1
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#define OP_SUB 2
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#define OP_MUL 3
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#define OP_CLR 4
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#define OP_RES 5
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/* ===== Global Variables ===== */
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unsigned int current_base;
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unsigned int input_num;
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unsigned int stored_num;
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unsigned int result;
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unsigned int operation;
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unsigned char result_displayed;
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unsigned int key, last_key, stable;
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unsigned int button_state, last_button_state, button_stable;
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unsigned char hex_operator_mode;
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unsigned long last_mode_press_time;
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/* Millisecond counter via SysTick */
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volatile unsigned long sys_millis = 0;
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/* ===== Function Declarations ===== */
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void delay(volatile unsigned int d);
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void lcd_delay(unsigned long r);
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void lcd_write_nibble(unsigned char nibble, unsigned char is_data);
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void lcd_cmd(unsigned char cmd);
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void lcd_data(unsigned char data);
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void lcd_init(void);
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void lcd_print_str(const char *str);
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void lcd_print_num(unsigned int num, unsigned int base);
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void display_mode(void);
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void display_input(void);
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void display_result(void);
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unsigned int scan_keypad(void);
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unsigned int scan_mode_button(void);
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unsigned int is_valid_digit(unsigned int key);
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void change_mode(void);
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void handle_mode_button(void);
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void operate(unsigned int op);
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void perform_operation(void);
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unsigned char is_operator_active(unsigned int key);
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unsigned int base_arith(unsigned int a, unsigned int b,
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unsigned int op, unsigned int base);
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unsigned long millis(void);
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/* ===== Utility ===== */
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void delay(volatile unsigned int d) {
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while (d--) __NOP();
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}
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void lcd_delay(unsigned long r) {
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volatile unsigned long i;
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for (i = 0; i < r; i++)
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;
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}
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/* ===== SysTick Millisecond Tracker ===== */
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void SysTick_Handler(void) {
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sys_millis++;
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}
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unsigned long millis(void) {
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return sys_millis;
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}
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/* ===== LCD Control ===== */
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void lcd_write_nibble(unsigned char nibble, unsigned char is_data) {
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unsigned long temp;
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temp = (nibble & 0x0F) << LCD_DATA_SHIFT;
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LPC_GPIO0->FIOPIN = (LPC_GPIO0->FIOPIN & ~LCD_DATA_MASK) | temp;
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if (is_data)
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LPC_GPIO0->FIOSET = LCD_RS;
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else
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LPC_GPIO0->FIOCLR = LCD_RS;
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LPC_GPIO0->FIOSET = LCD_EN;
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lcd_delay(100);
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LPC_GPIO0->FIOCLR = LCD_EN;
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lcd_delay(250000);
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}
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void lcd_cmd(unsigned char cmd) {
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lcd_write_nibble(cmd >> 4, 0);
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lcd_write_nibble(cmd, 0);
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}
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void lcd_data(unsigned char data) {
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lcd_write_nibble(data >> 4, 1);
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lcd_write_nibble(data, 1);
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}
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void lcd_init(void) {
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lcd_delay(5000000);
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lcd_write_nibble(0x03, 0);
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lcd_delay(500000);
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lcd_write_nibble(0x03, 0);
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lcd_delay(500000);
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lcd_write_nibble(0x03, 0);
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lcd_delay(500000);
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lcd_write_nibble(0x02, 0);
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lcd_delay(500000);
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lcd_cmd(0x28);
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lcd_cmd(0x0C);
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lcd_cmd(0x01);
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lcd_delay(500000);
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lcd_cmd(0x06);
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}
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void lcd_print_str(const char *str) {
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while (*str)
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lcd_data(*str++);
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}
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void lcd_print_num(unsigned int num, unsigned int base) {
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char buffer[17];
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int i = 0;
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if (num == 0) {
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lcd_data('0');
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return;
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}
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while (num > 0 && i < 16) {
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unsigned int d = num % base;
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buffer[i++] = (d < 10) ? ('0' + d) : ('A' + d - 10);
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num /= base;
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}
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while (i > 0)
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lcd_data(buffer[--i]);
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}
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/* ===== Display Helpers ===== */
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void display_mode(void) {
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lcd_cmd(0x80);
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lcd_print_str("Mode: ");
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if (current_base == MODE_BIN)
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lcd_print_str("BIN ");
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else if (current_base == MODE_BASE4)
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lcd_print_str("BASE4 ");
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else if (current_base == MODE_OCT)
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lcd_print_str("OCT ");
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else if (current_base == MODE_DEC)
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lcd_print_str("DEC ");
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else {
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lcd_print_str("HEX");
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if (hex_operator_mode)
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lcd_print_str("[OPS]");
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else
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lcd_print_str(" ");
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}
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}
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void display_input(void) {
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lcd_cmd(0xC0);
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lcd_print_str("Input: ");
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lcd_print_num(input_num, current_base);
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lcd_print_str(" ");
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}
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void display_result(void) {
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lcd_cmd(0xC0);
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lcd_print_str("Result: ");
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lcd_print_num(result, current_base);
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lcd_print_str(" ");
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}
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/* ===== Keypad and Button ===== */
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unsigned int scan_keypad(void) {
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unsigned int col, row, row_bits;
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for (col = 0; col < 4; col++) {
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LPC_GPIO0->FIOSET = COL_MASK;
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delay(50);
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LPC_GPIO0->FIOCLR = (1 << (COL_BASE + col));
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delay(200);
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row_bits = (LPC_GPIO0->FIOPIN & ROW_MASK) >> ROW_BASE;
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if (row_bits != 0x0F) {
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for (row = 0; row < 4; row++) {
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if (!(row_bits & (1 << row))) {
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LPC_GPIO0->FIOSET = COL_MASK;
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return col * 4 + row;
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}
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}
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}
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}
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LPC_GPIO0->FIOSET = COL_MASK;
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return 0xFF;
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}
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unsigned int scan_mode_button(void) {
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return ((LPC_GPIO2->FIOPIN & MODE_BUTTON) == 0) ? 1 : 0;
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}
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/* ===== Mode and Button ===== */
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void change_mode(void) {
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if (current_base == MODE_DEC)
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current_base = MODE_BIN;
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else if (current_base == MODE_BIN)
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current_base = MODE_BASE4;
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else if (current_base == MODE_BASE4)
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current_base = MODE_OCT;
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else if (current_base == MODE_OCT)
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current_base = MODE_HEX;
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else
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current_base = MODE_DEC;
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display_mode();
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input_num = stored_num = result = 0;
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operation = OP_NONE;
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result_displayed = 0;
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display_input();
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}
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void handle_mode_button(void) {
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unsigned long now = millis();
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if (button_stable == 3 && button_state == 1) {
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if (current_base == MODE_HEX) {
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if ((now - last_mode_press_time) < 2000) {
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hex_operator_mode = !hex_operator_mode;
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display_mode();
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last_mode_press_time = 0;
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} else {
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last_mode_press_time = now;
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}
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} else {
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change_mode();
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}
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}
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}
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/* ===== Validation ===== */
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unsigned int is_valid_digit(unsigned int key) {
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if (key >= 16)
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return 0;
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if (current_base == MODE_BIN && key >= 2)
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return 0;
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if (current_base == MODE_BASE4 && key >= 4)
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return 0;
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if (current_base == MODE_OCT && key >= 8)
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return 0;
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if (current_base == MODE_DEC && key >= 10)
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return 0;
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return 1;
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}
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/* ===== Arithmetic ===== */
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unsigned int base_arith(unsigned int a, unsigned int b,
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unsigned int op, unsigned int base) {
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unsigned int r;
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switch (op) {
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case OP_ADD:
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r = a + b;
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break;
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case OP_SUB:
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r = (a >= b) ? (a - b) : 0;
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break;
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case OP_MUL:
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r = a * b;
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break;
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default:
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r = a;
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break;
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}
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return r;
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}
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/* ===== Operation/Arithmetic Handling ===== */
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void operate(unsigned int op) {
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stored_num = input_num;
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input_num = 0;
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operation = op;
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result_displayed = 0;
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}
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void perform_operation(void) {
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result = base_arith(stored_num, input_num, operation, current_base);
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display_result();
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input_num = result;
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operation = OP_NONE;
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result_displayed = 1;
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}
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/* ===== Key Classifier ===== */
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unsigned char is_operator_active(unsigned int key) {
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if (key >= 11 && key <= 15) {
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if (current_base == MODE_HEX)
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return hex_operator_mode;
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else
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return 1;
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}
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return 0;
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}
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/* ===== MAIN ===== */
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int main(void) {
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current_base = MODE_DEC;
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input_num = stored_num = result = 0;
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operation = OP_NONE;
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result_displayed = 0;
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key = last_key = 0xFF;
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stable = 0;
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button_stable = 0;
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button_state = last_button_state = 0;
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hex_operator_mode = 0;
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last_mode_press_time = 0;
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/* ===== SystemClock & SysTick Setup ===== */
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SystemCoreClockUpdate();
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SysTick_Config(SystemCoreClock / 1000); // 1ms tick
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/* ===== Peripheral Init ===== */
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LPC_PINCON->PINSEL0 = 0;
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LPC_PINCON->PINSEL1 = 0;
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LPC_PINCON->PINSEL3 = 0;
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LPC_PINCON->PINSEL4 = 0;
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LPC_GPIO0->FIODIR |= COL_MASK;
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LPC_GPIO0->FIODIR &= ~ROW_MASK;
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LPC_GPIO0->FIOSET = COL_MASK;
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LPC_GPIO2->FIODIR &= ~MODE_BUTTON;
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LPC_GPIO0->FIODIR |= (0xFF << SEG_SHIFT);
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LPC_GPIO1->FIODIR |= DIGIT_EN;
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LPC_GPIO0->FIODIR |= LCD_DATA_MASK | LCD_RS | LCD_EN;
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lcd_init();
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display_mode();
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display_input();
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/* ===== Main Loop ===== */
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while (1) {
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key = scan_keypad();
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button_state = scan_mode_button();
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// Debounce keypad
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if (key == last_key)
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stable = (stable < 5) ? stable + 1 : stable;
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else {
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last_key = key;
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stable = 0;
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}
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// Debounce button
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if (button_state == last_button_state)
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button_stable = (button_stable < 5) ? button_stable + 1 : button_stable;
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else {
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last_button_state = button_state;
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button_stable = 0;
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}
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handle_mode_button();
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if (stable == 3 && key != 0xFF) {
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if (is_operator_active(key)) {
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switch (key) {
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case 11: operate(OP_ADD); display_input(); break;
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case 12: input_num = stored_num = result = 0;
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operation = OP_NONE; display_input(); break;
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case 13: operate(OP_SUB); display_input(); break;
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case 14: operate(OP_MUL); display_input(); break;
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case 15: perform_operation(); break;
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}
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} else if (is_valid_digit(key)) {
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result_displayed = 0;
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input_num = input_num * current_base + key;
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display_input();
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}
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stable = 5;
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}
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// Simple 7-seg base display
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LPC_GPIO0->FIOCLR = (0xFF << SEG_SHIFT);
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unsigned int segval = 0x3F; // default '0'
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if (current_base == MODE_BIN) segval = seven_seg[2];
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else if (current_base == MODE_BASE4) segval = seven_seg[4];
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else if (current_base == MODE_OCT) segval = seven_seg[8];
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else if (current_base == MODE_DEC) segval = seven_seg[0];
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else if (current_base == MODE_HEX) segval = seven_seg[0xA]; // 'A' for HEX
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LPC_GPIO0->FIOSET = (segval << SEG_SHIFT);
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LPC_GPIO1->FIOSET = DIGIT_EN;
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delay(3000);
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}
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}
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